/*	$Id: inet_aton.c,v 1.1.1.1 2003/10/31 21:29:36 jnathan Exp $	*/
/*	$OpenBSD: inet_addr.c,v 1.6 1999/05/03 22:31:14 yanick Exp $	*/

/*
 * ++Copyright++ 1983, 1990, 1993
 * -
 * Copyright (c) 1983, 1990, 1993
 *    The Regents of the University of California.  All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * -
 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
 * 
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies, and that
 * the name of Digital Equipment Corporation not be used in advertising or
 * publicity pertaining to distribution of the document or software without
 * specific, written prior permission.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
 * SOFTWARE.
 * -
 * --Copyright--
 */

#if defined(HAVE_CONFIG_H)
    #include "config.h"
#endif

#if defined(HAVE_SYS_TYPES) || defined(WIN32)
    #include <sys/types.h>
#endif
#if defined(HAVE_SYS_PARAM_H)
    #include <sys/param.h>
#endif
#if defined(HAVE_NETINET_IN_H)
    #include <netinet/in.h>
#endif
#if defined(HAVE_ARPA_INET_H)
    #include <arpa/inet.h>
#endif

#include <ctype.h>

#if defined(WIN32)
    #include <winsock2.h>
    #include <pcap.h>
#endif

/* 
 * Check whether "cp" is a valid ascii representation
 * of an Internet address and convert to a binary address.
 * Returns 1 if the address is valid, 0 if not.
 * This replaces inet_addr, the return value from which
 * cannot distinguish between failure and a local broadcast address.
 */
int inet_aton(const char *cp, struct in_addr *addr)
{
    u_int32_t val;
    int base, n;
    char c;
	unsigned int parts[4];
    unsigned int *pp = parts;

    c = *cp;
    for (;;)
    {
        /*
         * Collect number up to ``.''.
         * Values are specified as for C:
         * 0x=hex, 0=octal, isdigit=decimal.
         */
        if (!isdigit((int)c))
            return (0);
        val = 0; base = 10;
        if (c == '0')
        {
            c = *++cp;
            if (c == 'x' || c == 'X')
                base = 16, c = *++cp;
            else
                base = 8;
        }
        for (;;)
        {
            if (isascii((int)c) && isdigit((int)c))
            {
                val = (val * base) + (c - '0');
                c = *++cp;
            }
            else if (base == 16 && isascii((int)c) && isxdigit((int)c))
            {
                val = (val << 4) |
					(c + 10 - (islower((int)c) ? 'a' : 'A'));
				c = *++cp;
            }
            else
                break;
        }
        if (c == '.')
        {
            /*
             * Internet format:
             *	a.b.c.d
             *	a.b.c	(with c treated as 16 bits)
             *	a.b	(with b treated as 24 bits)
             */
            if (pp >= parts + 3)
                return (0);
            *pp++ = val;
            c = *++cp;
        }
        else
            break;
    }
    /*
     * Check for trailing characters.
     */
    if (c != '\0' && (!isascii((int)c) || !isspace((int)c)))
        return (0);
    /*
     * Concoct the address according to
     * the number of parts specified.
     */
    n = pp - parts + 1;
    switch (n)
    {
        case 0:
		    return (0);		/* initial nondigit */

        case 1:				/* a -- 32 bits */
            break;

        case 2:				/* a.b -- 8.24 bits */
            if ((val > 0xffffff) || (parts[0] > 0xff))
                return (0);
            val |= parts[0] << 24;
            break;

        case 3:				/* a.b.c -- 8.8.16 bits */
            if ((val > 0xffff) || (parts[0] > 0xff) || (parts[1] > 0xff))
                return (0);
            val |= (parts[0] << 24) | (parts[1] << 16);
            break;

        case 4:				/* a.b.c.d -- 8.8.8.8 bits */
            if ((val > 0xff) || (parts[0] > 0xff) || (parts[1] > 0xff) || 
                    (parts[2] > 0xff))
                return (0);
            val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
            break;
    }
    if (addr)
        addr->s_addr = htonl(val);
    return (1);
}
